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Now showing 1 - 10 of 91
  • PublicationMetadata only
    Preparation and in vitro evaluation of 5-flourouracil loaded magnetite-zeolite nanocomposite (5-FU-MZNC) for cancer drug delivery applications
    (2016-02-01) Sagir, Tugba; Huysal, Merve; Durmus, ZEHRA; Kurt, BELMA; Senel, Mehmet; Isik, Sevim; ZENGİN KURT, BELMA
    In this work, super paramagnetic magnetite nanoparticles were synthesized onto/into zeolite, then loaded with anti-cancer drug 5-fluorouracil (5-FU). The physical properties of the prepared nanocomposite and drug loaded nanocomposite were characterized using different techniques. The drug loading and releasing behavior of the magnetic nanocarrier was investigated and the drug-loaded nanoparticles exhibited a sustained release of drug without any burst release phenomenon. Furthermore, 5-FU loaded MZNC were evaluated for its biological characteristics. The functional 5-FU-MZNC has been triggered intra-cellular release of the cancer therapeutic agent 5-fluorouracil (5-FU). Cytotoxic effects of 5-FU loaded MZNC on human gastric carcinoma (AGS) cells were determined by real time cell analysis and colorimetric WST-1 cell viability assay. Apoptosis of cells was further investigated by Annexin-V staining which indicates the loss of cell membrane integrity. According to our results, 5-FU-MZNC showed a concentration-dependent cell proliferation inhibitory function against AGS cells. Morphologic and apoptotic images were consistent with the cytotoxicity results. In conclusion, 5-FU loaded MZNC efficiently inhibit the proliferation of AGS cells in vitro through apoptotic mechanisms, and may be a beneficial agent against cancer, however further animal study is still required. (C) 2015 Elsevier Masson SAS. All rights reserved.
  • PublicationMetadata only
    Synthesis and Cytotoxic Activity of New Sorafenib / Ruthenium Complexes,
    (2020-02-27T00:00:00Z) Zengin Kurt, Belma; Çakma, Elmas Begüm; Öztürk, Dilek; Dağ, Aydan; Benkli, Kadriye; ZENGİN KURT, BELMA; ÖZTÜRK CİVELEK, DİLEK; DAĞ, AYDAN
  • PublicationMetadata only
    Synthesis, antioxidant activity and SAR study of novel spiro-isatin-based Schiff bases
    (2018-12-01) Sönmez, Fatih; ZENGİN KURT, BELMA; Küçükislamoğlu, Mustafa; Avcı, Davut; GAZİOĞLU, IŞIL; Güneşli, Zuhal; ZENGİN KURT, BELMA; GAZİOĞLU, IŞIL
    A new series of 21 Schiff bases of spiro-isatin was synthesized, and their DPPH, CUPRAC and ABTS cation radical scavenging abilities were investigated for antioxidant activity. The results showed that all the synthesized compounds exhibited antioxidant activity for each assay. 5 & x30d;-(2,3-Dihydroxybenzylideneamino)spiro[[1,3] dioxolane-2,3 & x30d;-indoline]-2 & x30d;-on (5c) (IC50 = 4.49 mu M, for DPPH; IC50 = 0.39 mu M, for ABTS(.+); and A(0.50) = 0.42 mu M, for CUPRAC) showed significantly better ABTS, CUPRAC and DPPH radical scavenging ability than quercetin (IC50 = 8.69 mu M, for DPPH; IC50 = 15.49 mu M, for ABTS(.+); and A(0.50) = 18.47 mu M, for CUPRAC), which is used as a standard. SAR study showed that the synthesized compounds had higher ABTS(.+) activity than DPPH and CUPRAC activities. Moreover, the compounds (5c and 5d), containing two hydroxyl groups, exhibited the highest antioxidant activities for all assays. Quantum chemical calculations were also carried out to support SAR results.
  • PublicationMetadata only
    Two New Co(II) Complexes of Picolinate: Synthesis, Crystal Structure, Spectral Characterization, -Glucosidase nhibition and TD/DFT Study
    (2019-07-01) Alturk, Suemeyye; Avci, Davut; Kurt, BELMA; Tamer, Omer; Basoglu, Adil; Sonmez, Fatih; Atalay, Yusuf; Dege, Necmi; ZENGİN KURT, BELMA
    Co(II) complexes of 2-picolinic acid (picH) and 6-methylpyridine-2-carboxylic acid (6-MepicH) {[Co(pic)(2)2H(2)O], (1), [Co(6-Mepic)(pic)2H(2)O], (2)} were obtained and their structural and spectroscopic properties were investigated by XRD, FT-IR and UV-Vis spectroscopic techniques. The measurement of -glucosidase inhibition of the synthesized complex 2 was fulfilled by IC50 values. In order to provide further explanations about the electronic spectral properties, TD-DFT calculations in ethanol solvent and gas phase were carried out. HSEh1PBE/6-311G(d,p) level has been used to calculate the nonlinear optics (NLO) parameters and frontier molecular orbital (FMO) energies. The experimental refractive indexes and optical band gap energies for the Co(II) complexes have been obtained using FT-IR and UV-Vis spectra, respectively. Lastly, the molecular docking study of Co(II) complexes was carried out in order to demonstrate interactions between the synthesized complexes and target protein (the template structure S. cerevisiae isomaltase).
  • PublicationMetadata only
    Chitosan and carboxymethyl cellulose based magnetic nanocomposites for application of peroxidase purification
    (2017-03-01) Kurt, BELMA; Uckaya, FATİH; Durmus, ZEHRA; ZENGİN KURT, BELMA; UÇKAYA, FATİH
    Recently, protein purification methods have a very wide area of research. Many of these methods are both expensive and multi-stage methods, that are needed in specific equipment. In this study, biopolymer coated magnetic nanoparticles, carboxymethyl cellulose (CMC) and chitosan (CH) coated Fe3O4 (magnetite) nanocomposites, are used in a new purification process. The structure of the synthesized magnetic nanocomposites were characterized by Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric (TGA) analysis and zeta potential for surface charge of magnetic nanocomposites. Molecular weight and purification degree of peroxidase were estimated with SDS-PAGE. Peroxidase enzyme was purified a yield of 82.55% with carboxymethyl cellulose and 76.72% with chitosan using this method. (C) 2016 Elsevier B.V. All rights reserved.
  • PublicationMetadata only
    Novel metal complexes containing 6-methylpyridine-2-carboxylic acid as potent α-glucosidase inhibitor: synthesis, crystal structures, DFT calculations, and molecular docking
    (2020-01-01T00:00:00Z) Avcı, Davut; Altürk, Sümeyye; Sönmez, Fatih; Tamer, Ömer; Başoğlu, Adil; Atalay, Yusuf; ZENGİN KURT, BELMA; Dege, Necmi; ZENGİN KURT, BELMA
  • PublicationMetadata only
    Synthesis and Anticholinesterase Activity of Eugenol Derivatives
    (2017-05-07) ZENGİN KURT, BELMA; Sonmez, Fatih; Küçükislamoğlu, Mustafa; ZENGİN KURT, BELMA
  • PublicationMetadata only
    Synthesis and Characterization of Sorafenib Gold Complex
  • PublicationMetadata only
    Novel Cu(II), Co(II) and Zn(II) metal complexes with mixed-ligand: Synthesis, crystal structure, α-glucosidase inhibition, DFT calculations, and molecular docking
    (2019-12-05) Avcı, D.; Altürk, Sümeyye; Sönmez, F.; Tamer, Ömer; Başoğlu, Adil; Atalay, Y.; Kurt, Belma; Dege, N.; ZENGİN KURT, BELMA
  • PublicationMetadata only
    Synthesis, anticholinesterase activity and molecular modeling study of novel carbamate-substituted thymol/carvacrol derivatives
    (2017-02-15) KURT, Belma Zengin; Gazioglu, IŞIL; Dag, AYDAN; Salmas, Ramin Ekhteiari; Kayik, Gulru; Durdagi, Serdar; Sonmez, Fatih; ZENGİN KURT, BELMA; GAZİOĞLU, IŞIL; DAĞ, AYDAN
    New thymol and carvacrol derivatives with the carbamate moiety were synthesized and their inhibitory effects on acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) were evaluated. 5-isopropyl-2-methylphenyl(3-fluorophenyl)carbamate (29) was found to be the most potent AChE inhibitor with IC50 values of 2.22 mu M, and 5-isopropyl-2-methylphenyl (4-fluorophenyl)carbamate (30) exhibited the strongest inhibition against BuChE with IC50 value of 0.02 mu M. Additionally, the result of H4IIE hepatoma cell toxicity assay for compounds 18, 20, 29, 30 and 35 showed negligible cell death at 0.07-10 mu M. Moreover in order to better understand the inhibitory profiles of these molecules, molecular modeling studies were applied. Binding poses of studied compounds at the binding pockets of AChE and BuChE targets were determined. Predicted binding energies of these compounds as well as structural and dynamical profiles of molecules at the target sites were estimated using induced fit docking (IFD) algorithms and post-processing molecular dynamics (MD) simulations methods (i.e., Molecular mechanics Poisson-Boltzmann surface area (MM-PBSA) approaches). (C) 2016 Elsevier Ltd. All rights reserved.